An aqueous solution-gel method for low temperature synthesis of nanocrystalline NaNbO3 and their ceramics
An aqueous solution-gel method for low temperature synthesis of nanocrystalline NaNbO3 and their ceramics
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DOI：
10.1007/s10971-010-2238-1
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发表时间：
2010-05
影响因子：
2.5
通讯作者：
Weihong Liu;Hong Wang;Kecheng Li
中科院分区：
文献类型：
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作者：
Weihong Liu;Hong Wang;Kecheng Li
采用水溶液-凝胶法成功制备了纳米NaNbO 3粉体。采用TG/DSC、X射线衍射、FT-IR和拉曼光谱等方法研究了NaNbO 3粉体的相演变过程。结果表明，在375 °C左右可以得到纯的NaNbO 3相，比前人的工作降低了100 °C左右。在TEM研究中，其显示在750 °C下热处理4 h的粉末的平均粒径为约70 nm。在650 °C以下热处理4 h，粉末呈现Pmnm对称性，在650 °C以上热处理时，粉末由O3正交晶转变为O 1正交晶。
Nano-sized NaNbO3 powder has been successfully prepared by aqueous solution-gel method. The phase evolution of NaNbO3 powder is investigated by TG/DSC, X-rays spectra, FT-IR, and Raman spectra. The results show that the pure NaNbO3 phase has been obtained at about 375 °C, which is lowered by about 100 °C comparing to others’ work. In TEM studied, it shows the average particle size of ~ 70 nm for the powders heat-treated at 750 °C for 4 h. The powders heat-treated below 650 °C for 4 h shows a Pmnm symmetry, then change from O3 orthorhombic to O1 orthorhombic with the heat-treatment temperature above 650 °C.